Bleaching apparatus.



F. a. TEN BROECK. BLEACHING APPARATUS.

APPLICATION FILED FEB. 16, 1915.

1,167,? A Patented Jan. 11, 1916.

INVENTOI? dwcm ran s rarns rare orricn.

FLOYD G. TEN BROECK, OF NEW YORK, N. Y., ASSIGNOR TO WEST VIRGINIA PULP 8: PAPER COMPANY, OF NEW YORK, N. Y., A CORPORATION OF WEST VIRGINIA.

BLEACHING- APPARATUS.

Specification of Letters Patent.

Patented Jan. 11, rare.

Application filed February 16, 1915. Serial No. 8,490.

To all whom it may concern:

Be it known that I, FLOYD G. TEN BnoncK,

a citizen of the United States, and resident of. the borough of Brooklyn, county of Kings, city and State of Xew York, have I made a certain new and useful Invent on Relatingto Bleaching Apparatus, of wlnch the following is a specification, taken in connection with the accompanying drawing, which forms part of the same This invention relates especially to apparatus for bleaching fibrous material for use in textile or paper manufacture,such for example as wood pulp, and is adapted to bleach such material when containing so little water as to be in a substantially nonfluent or plastic condition. For this purpose one or more large elongated rotary bleachers are used .each adapted to hold a charge amounting to many tons of the material and feed it slowly. through the bleacher by the combined effect of its slow rotation and slight inclination. The bleacher may be divided into several chambers by spaced partitions and thesechambers may be provided with suitable mixing and agitating means or projections such as ribs projecting inward from .the wall of the bleacher which are preferably so formed as to give it more energetic agitating and mixing action adjacent the feed end of the cylindrical unit. The bleacher may also, if desired, be formed with a reduced diameter mixing feed cham ber axially mounted on the feed end of the bleacherfand provided with a rotary beater and -feeder to thoroughly mix and incorporate the bleach and fibrous material and feed it' intothe bleacher itself through which fed through one: of these. rotary bleachers and then thematerial' discharged into a.

washer to thoroughly eliminate the reaction products from the pulp which can then be incorporated with asecond charge of bleach and similarly pass through a second rotary bleacher which may with advantage be oppositely inclined and arranged alongside oradjacent the first so that the bleached pulp may be discharged adjacent the feed end of the first bleacher.

In the accompanying drawings showing in a somewhat diagrammatic way an illustrative embodiment of this invention, F igure 1 is an elevation, parts being shown in section. Fig. 2 is a transverse section along the line 2'-2"of Fig. 1. Fig. 3 is a similar section along the line 3' -3.

The elongated rotary bleacher which may be of any suitable construction may have a length of 100 to 200 feet more or less and a diameter of 8 to 10 or 15 feet or so, so that it will hold and handle a charge of many. tons of the thick mixture of fibrous material and bleach which may of course be any desired bleaching composition such as the usual chlorinated lime or the like. The. bleacher is preferably mounted at a slight lIlCll112ltl0l1 which promotes the desired gradual feed of the material therethrough when it is slowly rotated by any suitable means andthis may be further regulated by forming internal feeding or feed regulating devices throughout or at intervals along the interior of the bleacher. The bleacher may be conveniently constructed in the same general manner as the large rotary kilns which are used in the Portland cement industry and as indicated in the drawing thebleacher may have the substantially cylindrical shell 30 of sheet steel or the like to which are secured at intervals along its length suitable tires 37, each of which may be supported on two or more bearing rolls 28 mounted in bearing blocks, such as 29. For rotating the bleacher a crown gearv 32 may be conveniently secured to the shell and slowly rotated by a suitable drive gearing such as 3-1 operated from any desired source of power.

The bleacher may be provided with a substantially inert lining 9 of brickwork, cement concrete, or the like, which for a shell ten feetor so in diameter may have a thickness of some 4 to 6 inches and be provided with integral or otherwise formed partitions, such as 12, 15, having restricted axial passages 13, 16 therethrough of the desired size so as to form a. series of bleacher chambers between these partitions. Suitable agitating and mixing devices such as ribs or projections of "arious forms may be provided in the inside of the bleacher especially adjacent its feed end to insure the desired agitation or mixing of the charge, and if desired, suitable positively lifting or bucket ribs, such as 11, may be formed in this agitating,

cal

mixing chamber as by securing these heavy Inetal'ribs to the bleacher shell or otherwise securely mounting them in position, see Fig. 2. Other forms of agitating devices may be used at various parts of the bleacher, such a for example, asthe substantially radial agitating ribs 14; shown in Fig. 3 which may be feeding of the charge through the bleacher.

at any desired points, such, for example, as

the spiral feeding ribs 17 which may be se-- cured to the shell or lining and project any desired distance into the bleacher so as to promote the forward movement of the charge in proportion to the pitch of these ribs which may extend continuously a number of times around the bleacher or extend only part way around as desired. I I The charge of wood pulp or other fibrous material and bleach may be mixed and fed into the bleacher in any desired way preferably in a substantially non-fluent or plastic condition as when the mixture contains some 15 to 25 percent. or so of pulp and has a somewhat doughy consistency. If desired, a mixing feeding device may be secured directly-to the bleacher and may be given the form of the reduced diameter mixing feed chamber 3 which may be axially secured to the feed end of the bleacher and have a slip joint connection 10 with the stationary receiving or feed hopper 2. The feeder 4 may be mounted in this feed chamber and rotated preferably in the same direction as the direction -of-the rotation of the main bleacher. by the drive pulley or device 6' on the shaft beyond the bearing 5in the hopper so that the helical beater blades have a positive feeding action to mix and force the material into the first chamber. of the bleacher, a suitable spreader or deflector being if desired used at this point, suchfor instance as the conical deflector 7, which may be mounted on the end of the beater soas to deflect the entering material toward the conical lining 8 which is advantageous for some pur oses.

he unbleached pulp may be fed into the hopper 2 and the solution of hypo-chlorite of lime or other bleach may be simultaneously supplied to the hopper as through the bleach pipe 1, the material being engaged by the beater and thoroughly and preferably substantially uniformly incorporated before being fed into the first chamber of the mainbleacher. In regular practice, it seems de the feeding and feed regulating devices therein, a number of hours bleaching treatment of this character being desirable in eflecting the gradual bleaching'of the pulp and thus minimizing the chance of injury and this makes it unnecessary to use high bleaching temperatures which is a further advantage as is also the exclusion of light during the bleaching operation. The bleached material may be finally discharged from the bleacher as through a restricted discharge passage 19 which may be in the form of a discharge flange as indicated and thereafter the bleached pulp or other material may be given any desired subsequent treatment.

' In bleaching wood pulp it is for some purposes desirable to effect the bleaching in several stages and to thoroughly eliminate the reaction products from the partly bleached material so as to minimize any staining action that they might have on the finishedpulp. For this purpose it is desirable to incorporate part of the bleach with the pulp in. the first instance and then feed it through one of these rotary bleachers into a Washer of any desired construction and -which may as indicated in Fig. 1 comprise a cylinder 23 revolved by the shaft 22. The

pulp may thus be dried by the removal of the desired proportion of water and may then be removed from the cylinder and discharged into the feed chute 26 orany other suitable feeding device communicating with the feed hopper 27 of' -a second-similar rotary bleacher unit which may be oppositely side the first bleacher on substantially the same level, so that its discharge end is adjacent the feed end of the first unit. Suitable the pipe 24 and the mixture thoroughly incorporated and fed-intoand through this second bleacher 31 having similar construction and operation. The thoroughly bleached material may .be discharged through the flange 19 into the chute -35. of any suitable" inclined and arranged with advantage be- 7 bleaching liquor may be supplied through to the first bleacher unit until the material is discharged from the second or final bleacher.

This invention has been described in connection with a number of illustrative embodiments, forms, proportions, materials, parts and arrangements, to the details of which it is not of course limited, since what is claimed as new and what is desired to be secured by Letters Patent is set forth in the appended claims:

1. In fiber pulp bleaching apparatus, a large diameter rotary elongated inclined bleacher having spaced partitions forming a number of communicating chambers therein, internally projecting agitating and mixing devices in said bleacher including radially arranged bucket ribs, feeding means cooperating with the feed end of said bleacher, a reduced axially arranged discharge on the discharge end of said bleacher, a continuous washer device receiving the bleached material from said bleacher to wash and partly dry the same, and a second elongated rotary bleacher connected to said washer to receive material therefrom and arranged adjacent and substantially alongside the first bleacher and inclined in the opposite direct-ion to discharge the bleached material adjacent the feed end of said first bleacher.

'2'. In fiber bleaching apparatus, a large diameter rotary elongated inclined bleacher having spaced partitions forming a number means to diameter rotary elongated bleacher having a substantially cylindrical form and provided with internally projecting agitating and mixing devices adjacent its feed end, continuously feed into said bleacher a mixture of fibrous material and bleach, a continuous washing device receiving the bleached material from said bleacher to wash and partly dry the same, and a second elongated rotary bleacher connected to said washer to receive bleach and material from said washer and arranged substantially alongside the first bleacher to discharge the bleached material adjacent the feed end of said first bleacher.

4. In fiber bleaching apparatus, a large diameter rotary elongated bleacher having a substantially cylindrical form, means to feed into said bleacher a mixture of fibrous material and bleach, a washing device receiving the bleached material from said bleacher to wash and partly dry the same, and a second elongated rotary bleacher connected to said washer to receive bleach and material from said washing device.

5. In fiber bleaching apparatus, a large diameter rotary bleacher provided with internally projecting agitating mixing devices, means to continuously feed into said bleacher fibrous material and bleach, a washing device receiving the bleached material from said bleacher, and a second large diameter rotary bleacher connected to said washing device to receive material therefrom. a

6. In fiber bleaching apparatus, a rotary elongated bleacher, means to feed fibrous material and bleach into said bleacher, a washing. device receiving the bleached material from said bleacher to wash thesame and a second elongated rotary bleacher to receive the material from said washing device.

FLOYD G. TEN BROECK. 

